Publication Abstracts

Carbohydrate-electrolyte solution effects on physical performance of military tasks

Mountain SJ, Shippee RL, Tharion WJ
Aviat Space Environ Med 1997;68:384-91

Abstract

Background: Physical performance of military tasks can deteriorate during field training. Hypothesis: Drinking a carbohydrate-electrolyte (CHO-E) beverage during military relevant training would improve fluid and caloric intake, and better sustain physical performance. Methods: Some 27 volunteers restricted to ~2600 kcal · d^-1 were randomly assigned to one of three groups: CHO-E, placebo, or water. Fluid intake was ad libitum. The volunteers completed 3 d of field training in hot humid conditions (30°C, 60% rh). Training days 1 and 2 each included a 16 - 21 km march over hilly terrain, marksmanship training, and 2 h of rock climbing. Day 3 included a 14.5 km march followed by marksmanship tests, a timed rock climb and a 0.7 km uphill (21% grade) run. Results: The CHO-E beverage provided an additional ~2800 kcal (p < 0.05) for the 3 d of training. There were no difference (ANOVA, p > 0.05) between the groups' absolute or changes from pre-training values for fluid intake, body weight, climb time, run time, marksmanship, or mood. Those drinking CHO-E were, however, more likely to maintain uphill run performance after training (x² = 7.2; p < 0.05) and more likely to maintain both uphill run and marksmanship ability (x² = 17.2; p < 0.05). There were also an inverse relationship between caloric intake and deterioration of uphill run performance (r = -0.75; p < 0.05). Conclusions: Persons drinking CHO-E or practicing good food discipline are more likely to sustain physical performance than those eating only a portion of their food. CHO-E provides an accessible source of calories which can be advantageous when limited food is available or inadequate food consumption is likely.

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Table of Contents for Volume 68, Number 5 of the ASEM journal.